Question: What is the death date of Peter, Count of Perche and Alençon, the son of Louis IX of France?
Paraphrase: When did Peter, Count of Perche and Alencon, son of Louis IX of France, die?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q346 p:P40 ?s . ?s ps:P40 wd:Q739327 . ?s pq:P570 ?value}